An alliance of left-wing movements in France, the Popular Front (Front Populaire) won the May 1936 elections, leading to the first French government headed by a socialist prime minister, Léon Blum (1872–1950), from 5 June 1936 to 21 June 1937. After the anti-parliamentarian riots of 6 February 1934, which violently opposed fascist leagues to leftist organisations, the three main left-wing parties, Radical-Socialists, the Section française de l’internationale ouvrière (SFIO, the French Section of the Workers’ International) and the Parti communiste français (PCF, French Communist Party), joined forces, giving way in 1935 to one unified group to counter the rise of fascism in France.